//
//
// Copyright 2023 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//

#ifndef GRPC_SRC_CORE_LIB_SECURITY_AUTHORIZATION_AUDIT_LOGGING_H
#define GRPC_SRC_CORE_LIB_SECURITY_AUTHORIZATION_AUDIT_LOGGING_H

#include <grpc/grpc_audit_logging.h>
#include <grpc/support/json.h>
#include <grpc/support/port_platform.h>

#include <map>
#include <memory>

#include "src/core/util/sync.h"
#include "absl/base/thread_annotations.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"

namespace grpc_core {
namespace experimental {

class AuditLoggerRegistry {
 public:
  static void RegisterFactory(std::unique_ptr<AuditLoggerFactory>);

  static bool FactoryExists(absl::string_view name);

  static absl::StatusOr<std::unique_ptr<AuditLoggerFactory::Config>>
  ParseConfig(absl::string_view name, const Json& json);

  // This assume the given config is parsed and validated already.
  // Therefore, it should always succeed in creating a logger.
  static std::unique_ptr<AuditLogger> CreateAuditLogger(
      std::unique_ptr<AuditLoggerFactory::Config>);

  // Factories are registered during initialization. They should never be
  // unregistered since they will be looked up at any time till the program
  // exits. This function should only be used in tests to clear the registry.
  static void TestOnlyResetRegistry();

 private:
  AuditLoggerRegistry();

  static Mutex* mu;

  static AuditLoggerRegistry* registry ABSL_GUARDED_BY(mu);

  // The key is owned by the factory.
  std::map<absl::string_view, std::unique_ptr<AuditLoggerFactory>>
      logger_factories_map_ ABSL_GUARDED_BY(mu);
};

}  // namespace experimental
}  // namespace grpc_core

#endif  // GRPC_SRC_CORE_LIB_SECURITY_AUTHORIZATION_AUDIT_LOGGING_H
